Evaluation of the treatment of chromite ore processing residue by ferrous sulfate and asphalt

Moon, Deok Hyun; Wazne, Mahmoud; Koutsospyros, Agamemnon; Christodoulatos, Christos; Gevgilili, Halil; Malik, M.; Kalyon, Dilhan M.

doi:10.1016/j.jhazmat.2008.09.079

Cited by 34 publications

(4 citation statements)

References 24 publications

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“…It was verified in this study that Cr 2 O 3 was a suitable Cr(III) standard reference through the XANES coupled with EXAFS method. However, Cr 2 O 3 had a higher absorbance value at 5993 eV than other standard Cr(III) references such as CrCl 3 or Cr(NO 3 ) 3 , which were usually used as standard Cr(III) reference in many previous reported researches on Cr(VI) detection by XANES alone method. ,,, Hence, EXAFS study was required to be performed on the rationality of the Cr(III) standard sample in these studies.…”

Section: Resultsmentioning

confidence: 99%

Pyrolysis Treatment of Chromite Ore Processing Residue by Biomass: Cellulose Pyrolysis and Cr(VI) Reduction Behavior

Zhang

et al. 2016

Environ. Sci. Technol.

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ABSTRACT:The pyrolysis treatment with biomass is a promising technology for the remediation of chromite-oreprocessing residue (COPR). However, the mechanism of this process is still unclear. In this study, the behavior of pyrolysis reduction of Cr(VI) by cellulose, the main component of biomass, was elucidated. The results showed that the volatile fraction (VF) of cellulose, ie. gas and tar, was responsible for Cr(VI) reduction. All organic compounds, as well as CO and H 2 in VF, potentially reduced Cr(VI). X-ray absorption nearedge structure (XANES) spectroscopy and extended X-ray absorption fine-structure (EXAFS) spectroscopy confirmed the reduction of Cr(VI) to Cr(III) and the formation of amorphous Cr 2 O 3 . The remnant Cr(VI) content in COPR can be reduced below the detection limit (2 mg/kg) by the reduction of COPR particle and extension of reaction time between VF and COPR. This study provided a deep insight on the co-pyrolysis of cellulose with Cr(VI) in COPR and an ideal approach by which to characterize and optimize the pyrolysis treatment for COPR by other organics.

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Section: Resultsmentioning

confidence: 99%

Pyrolysis Treatment of Chromite Ore Processing Residue by Biomass: Cellulose Pyrolysis and Cr(VI) Reduction Behavior

Zhang

et al. 2016

Environ. Sci. Technol.

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“…Hexavalent chromium, Cr(VI), is a highly toxic pollutant occurring in the effluents of a number of industries including mining, electroplating, tanning, and fertilizer (Nyangababo et al 2005). Since it is capable of bio-accumulating in the body especially in the liver, stomach, and kidneys, its removal from the aquatic environment is of utmost importance (Moon et al 2009, Elwakeel et al 2018. Cr(VI) is found in aqueous solutions as anions in forms of CrO 4 2− , Cr 2 O 7 2−…”

Section: Introductionmentioning

confidence: 99%

Chitosan-coated sour cherry kernel shell beads: an adsorbent for removal of Cr(VI) from acidic solutions

Altun

2019

J Anal Sci Technol

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In this study, a composite biosorbent in the form of beads was produced from chitosan and the powder of sour cherry kernel shells. Characterization of chitosan-coated sour cherry kernel shell beads was done using elemental analysis, FT-IR spectroscopy, SEM, and EDX spectrum analysis. Adsorption capacity of chitosan-coated sour cherry kernel shell beads was tested in removal of Cr(VI) under different conditions, pH 2.0-7.0, adsorbent dosage 0.01-0. 20 g, initial Cr(VI) ion concentration 10-315 mg L −1 , temperature 25-55°C, and contact time 0-240 min, and compared to that of uncoated sour cherry kernel shell powder. Cr(VI) adsorption was highly dependent on the solution pH, and the maximum Cr(VI) adsorption was achieved at pH 2.03 at 25°C in 45 min. The adsorption data was applied to Langmuir, Freundlich, Scatchard, and Dubinin-Radushkevich (D-R) adsorption isotherm models. According to the Langmuir isotherm model, the adsorption capacity of chitosan-coated sour cherry kernel shell beads was found higher than that of uncoated sour cherry kernel shell powder, 24.492 and 13.57 mg g − 1. The study demonstrated that chitosan-coated sour cherry kernel shell beads can be used for Cr(VI) removal from acidic aqueous solutions.

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“…Chromium is the most common heavy metal as a groundwater contaminant and it occurs in two oxidation states; Cr 6+ such as chromate and bichromate (CrO 4 2− , HCrO 4 − ) and trivalent chromium (Cr 3+ ). Cr 6+ is more carcinogenic and toxic to humans than Cr 3+ [1]. There needs to remove these toxic metals from water by using proper water treatment techniques.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Adsorption Behavior of Novel Sandwiched Composite Electro-Spun Aminated Membrane for Hexavalent Chromium Removal

Kahraman¹,

Pehlivan²,

Avcı³

2018

IJCEA

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Evaluation of the treatment of chromite ore processing residue by ferrous sulfate and asphalt

Cited by 34 publications

References 24 publications

Pyrolysis Treatment of Chromite Ore Processing Residue by Biomass: Cellulose Pyrolysis and Cr(VI) Reduction Behavior

Pyrolysis Treatment of Chromite Ore Processing Residue by Biomass: Cellulose Pyrolysis and Cr(VI) Reduction Behavior

Chitosan-coated sour cherry kernel shell beads: an adsorbent for removal of Cr(VI) from acidic solutions

Preparation and Adsorption Behavior of Novel Sandwiched Composite Electro-Spun Aminated Membrane for Hexavalent Chromium Removal

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